do_loop.frm

vb编程+从基础到实践光盘代码

VERSION 5.00
Begin VB.Form do_loop 
   Caption         =   "Form1"
   ClientHeight    =   2520
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4425
   LinkTopic       =   "Form1"
   ScaleHeight     =   2520
   ScaleWidth      =   4425
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "求     解"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   1320
      TabIndex        =   5
      Top             =   1680
      Width           =   1455
   End
   Begin VB.TextBox Text2 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   3360
      TabIndex        =   4
      Top             =   240
      Width           =   855
   End
   Begin VB.TextBox Text1 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   2280
      TabIndex        =   3
      Top             =   240
      Width           =   855
   End
   Begin VB.Label Label3 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   3120
      TabIndex        =   2
      Top             =   1080
      Width           =   975
   End
   Begin VB.Label Label2 
      Caption         =   "m 和 n 的最大公约数是:"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   240
      TabIndex        =   1
      Top             =   1080
      Width           =   2655
   End
   Begin VB.Label Label1 
      Caption         =   "请输入两个正整数:"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   120
      TabIndex        =   0
      Top             =   240
      Width           =   2055
   End
End
Attribute VB_Name = "do_loop"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
Dim m As Long, n As Long, temp As Long
If (Val(Text1.Text) = 0 Or Val(Text2.Text) = 0) Or Val(Text1.Text) > 2147483647 Or Val(Text2.Text) > 2147483647 Then
MsgBox "输入的数0或溢出，请重新输入！"
MsgBox "输入的数0或溢出,请重新输入!", vbInformation + vbOKOnly, "数据错误"
Text1.Text = ""
Text2.Text = ""
Text1.SetFocus
Else
m = Val(Text1.Text)
n = Val(Text2.Text)
If m < n Then
  temp = m: m = n: n = temp
End If
Do
  r = m Mod n
  m = n
  n = r
Loop While r <> 0
  Label3.Caption = m
End If
End Sub